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type section

American  

noun

Geology.

  1. the sequence of strata referred to in establishing a stratigraphic unit, as a member or formation.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.